After update iOS 9 and Facebook sdk 4.6 the login

问题:

I update my Xcode to 7 , and Facebook to 4.6 sdk.

this My warning :

Warning: Attempt to present <FBSDKContainerViewController: 0x159337700> on <UIAlertController: 0x159262700> whose view is not in the window hierarchy!

in My project the BitCode is NO - because if I turn it to Yes I got this Error :

ld:'/Users/MyName/Desktop/MyProjectName/ProjectName/ProjectName/Resources/Frameworks/Fabric.framework/Fabric(Fabric.o)' does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

this is the parse method :

-(void)signInWithFacebookClicked
{
NSArray *permissions = [NSArray arrayWithObjects:@"email",@"user_friends", nil];
[PFFacebookUtils logInInBackgroundWithReadPermissions:permissions block:^(PFUser *user, NSError *error)
 {
     if (!user) // The user cancelled the Facebook login
     {
         NSLog(@"Uh oh. The user cancelled the Facebook login.");
     }
     else if (user.isNew) // New user (not stored on DB) - User signed up and logged in through Facebook
     {
         [self handleNewUser];
     }
     else if (user) // the user is exist at DB
     {
       // the user is exist at DB  
     }
     else if (error)
     {
        // showAlertOfSomethingWentWrong
     }
 }];
}

this is FBSDKGraphRequest :

-(void)handleNewUser
{

FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:@{@"fields": @"friends, first_name, gender, last_name, link, name, verified, picture, email"}];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error)
 {
     NSMutableDictionary *userData = (NSMutableDictionary *)result;
}];

my problem is that that line :

[PFFacebookUtils logInInBackgroundWithReadPermissions:permissions block:^(PFUser *user, NSError *error)

the run never go into this block in iPhone , in simulator this work fine.

回答1:

I had a similar problem where I was trying to show a login alert on top of FBSDKContainerViewController.

In this call

- (void)logInWithReadPermissions:(NSArray *)permissions
          fromViewController:(UIViewController *)fromViewController
                     handler:(FBSDKLoginManagerRequestTokenHandler)handler;

Facebook presents its own view controller and if you don't specify the fromViewController, "the topmost view controller will be automatically determined as best as possible."

In your case, it sounds like Facebook is trying to present on top of an alert that was dismissed, even if this is not the call being invoked.

回答2:

do you add NSAppTransportSecurity & LSApplicationQueriesSchemes key to your info.plist?

回答3:

I did find a workaround to this, thanks to @PastryPup's answer.

The warning is displayed when trying to present the Facebook login view controller on top of a dismissed alertview. Switching to a UIAlertController, however, fixed the problem.

My impression is that this works because UIAlertController is a full-fledged controller, and thus exists in the view hierarchy even after it has been dismissed.

The solution is to basically replace the UIAlertView with a UIAlertController, and call [PFFacebookUtils logInInBackgroundWithReadPermissions:permissions block:^(PFUser *user, NSError *error) inside the default action of the UIAlerController.

Link on how to implement a UIAlertController

回答4:

I did some trick to make this work. I don't know if it's the best way to do it. But i just made a boolean that is false before the activity executes (the fb button is tapped). So after it returns, just set the boolean to true and have a condition in the ViewDidAppear that if the boolean is true perform the segue to the next window you want to go. I hope it helps!